X15 2450 low power high fuel consumption

[Will144]

Hello everybody, I have an x15 2450 down on power ( feels sluggish) and fuel consumption is way up. About a month ago, after having a week off, I started my truck and had the low coolant lamp on. I thought that it was odd because before I went on vacation I looked everything over and fixed a couple of things. I topped it off hooked up when I started driving I had a cloud of steam behind me. It didn't occur to me right away something was very wrong but I turned around (put 8 miles on) by the time I got back to the yard. I pulled the pipe off the back of the egr cooler and found coolant! Could get in to the stealer for a week so I figured I'd conquer it myself. Pulled the bellow pipe off the front pressurized the coolant egr cooler filled up, ordered part. My old cooler was the square style was told it was superceded to the round style and I would have to get a different calibration because of it. Removed doc and dpf, found coolant , had baked at local stealer. Removed egr, mixing tube, and cross over pipe cleaned them out. Replaced delta p, cleaned exhaust pressure sensor housing and tube replaced sensor also, along with imap. Reassembled got the dealer to calibrate it thought I was good to go. Loaded a headed out.

Well, it wasn't long before I started realizing something isn't quite right, about halfway through the next day power didn't seem like it was there when I really put my foot in it. Finished my round when I got home looked over it again found exhaust manifold leak at the joint. Bought a slightly used manifold off a new truck from local demandator hack. Still same symptoms. Did a leak down test drop 8000psi in a minute. Relief valve checked good so I started capping injectors. Found number three to be leaking retorqued tube and wow drop 500 psi in 5 minutes. Also I think I get an occasional miss however I can't pin point with a cutout. Will run on all six by themselves (cutting out the other five). Ran over head, nothing seemed like anything was out of adjustment. Barring engine over I could hear hissing on one cylinder thought It might be intake valve but when I put my ear to the intake hole I couldn't hear it sounded more to be coming from crankcase felt the same as other 5. Next I was thinking turbo damage because of coolant removed actuator cycled very easy no hangup. Removed turbo to inspect turbine housing all looked great.

I'm really stumped, I am one that never asks for help, I've always been able to figure things out. Yeah, I 've shot the parts Canon at things in the past, but with the cost of parts for these you just can't. I have noticed the egr valve likes to be open anywhere from 70 to 80 percent running down the road seems high, also intake nox seems high but I have nothing to compare it to. I'm almost wondering if the injectors are [/align]fueling right I have heard these have injector issues that will melt the dpf. Could the cooler be a symptom of a bigger problem. There is a shop nearby with a dyno, maybe put it on that, possibly pull the exhaust pipe check for smoke while cutting injectors. Or could it be the new calibration. Any thoughts?